Dr. Dolittle was a "begging for more " on most chapters for us! (though we read aloud). Also, My Father's Dragan series. Not sure of the ages of your kids though. My readers are 7 and 8. They also often could not put down the Little House series.
I see the original poster was asking for great read alouds, and Jennifer, you are looking for great can't-put-down books for quiet time. I have an interesting theory here. I'm finding I want to hold onto the "can't-put-down" books to use more as read-aloud, otherwise my kids are racing through, just SO eager to see what happens next! Of course, it's great when they've found a book they love, but my fear (still slightly unfounded but I am beginning to monitor) is that they are so caught up in wanting to know "what next" that they are skipping over some of the descriptive writing in favour of plot.
I suppose I should be pleased though that they enjoy reading so much
Have fun making your choices! Andi